In preparation for `CREATE VIEW`, we need to have the original sql query
that was used to create the view. I'm using the scanner's offset to
slice into the original input, trimming the newlines, and passing it to
the translate function.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1621
Instrument trace_insn to debug print its the stack pc and instruction.
Also, disable rustyline logs for the CLI as it is too noisy to work
with.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1635
We were opening Write cursors inside of the rewind loop, which meant
that we were opening the same cursor multiple times per iteration. Also,
in this case, we need to open all indexes before the loop starts, and
avoid opening the same cursor again. While I was trying to debug this, I
also added instrumentation to some functions, so that I could track
where the instructions were being emitted. This helped me a lot. The
`#[instrument]` macro creates a span for the particular function, which
enables us to examine the path our functions are taking when any log is
emitted. Lastly, I fixed an explain bug, where it was unwrapping a None
`CursorKey` when opening the `sqlite_schema` table.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1640
* Without tracing crate we cannot log anything that happens in
limbo_core
* IO never ran in step loop inside simulator.
* Added update queries (which currently loop forever for some reason I'm
debugging).
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1627
* Without tracing crate we cannot log anything that happens in
limbo_core
* IO never ran in step loop inside simulator.
* Added update queries (which currently loop forever for some reason I'm
debugging).
Again found when fuzzing nested where clause subqueries:
Aggregate registers need to be NULLed at the start because the same
registers might be reused on another invocation of a subquery, and if
they are not NULLed, the 2nd invocation of the same subquery will have
values left over from the first invocation.
Reviewed-by: Preston Thorpe (@PThorpe92)
Closes#1614
Found while fuzzing nested subqueries. Since subqueries result in nested
plans, it quickly revealed that there can be multiple `DeferredSeek`
instructions issued for different cursors, but our `ProgramState` only
supported one at a time.
Closes#1610
**Beef:** we need to distinguish between references to tables in the
current query scope (CTEs, FROM clause) and references to tables from
outer query scopes (inside subqueries, or inside CTEs that refer to
previous CTEs). We don't want to consider 'tables from outside' in the
join order of a subquery, but we want the subquery to be able to
_reference_ those tables in e.g. its WHERE clause.
This PR -- or at least some sort of equivalent of it -- is a requirement
for #1595.
---
This PR replaces the `Vec<TableReference>` we use with new data
structures:
- TableReferences struct, which holds both:
- joined_tables, and
- outer_query_refs
- JoinedTable:
- this is just a rename of the previous TableReference struct
- OuterQueryReference
- this is to distinguish from JoinedTable those cases where
e.g. a subquery refers to an outer query's table, or a CTE
refers to a previous CTE.
Both JoinedTable and OuterQueryReference can be referred to by
expressions,
but only JoinedTables are considered for join ordering optimization and
so
forth.
These data structures are then used everywhere, which resulted in a lot
of changes.
Reviewed-by: Pere Diaz Bou <pere-altea@homail.com>
Closes#1580
Add simple stress test run with 10k iteration to test `Delete`, `Update`
and `Insert` together.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1585
- TableReferences struct, which holds both:
- joined_tables, and
- outer_query_refs
- JoinedTable:
- this is just a rename of the previous TableReference struct
- OuterQueryReference
- this is to distinguish from JoinedTable those cases where
e.g. a subquery refers to an outer query's table, or a CTE
refers to a previous CTE.
Both JoinedTable and OuterQueryReference can be referred to by expressions,
but only JoinedTables are considered for join ordering optimization and so
forth.
This commit does not compile.
Currently we have this:
`program.alloc_cursor_id(Option<String>, CursorType)`
where the `String` is the table's name or alias ('users' or 'u' in the
query).
This is problematic because this can happen:
`SELECT * FROM t WHERE EXISTS (SELECT * FROM t)`
There are two cursors, both with identifier 't'. This causes a bug where
the program will use the same cursor for both the main query and the
subquery, since they are keyed by 't'.
Instead introduce `CursorKey`, which is a combination of:
1. `TableInternalId`, and
2. index name (`Option<Arc<Index>>` -- in case of index cursors.)
This should provide key uniqueness for cursors:
`SELECT * FROM t WHERE EXISTS (SELECT * FROM t)`
here the first 't' will have a different `TableInternalId` than the
second `t`, so there is no clash.
---
These `CursorKey`s are only required when the program needs to retrieve
the cursor ID later:
`program.resolve_cursor_id(key)`
So, there are now two methods for allocating cursors:
`program.alloc_cursor_id_keyed(key, cursor_type); // needs to be
retrieved later with same key`
`program.alloc_cursor_id(cursor_type); // does not need to be retrieved
later`
Reviewed-by: Preston Thorpe (@PThorpe92)
Closes#1604
